We've just applied a hotfix that removes the faction requirements for Justice gear.

Shado-Pan and August Celestial factions will no longer require Golden Lotus faction to purchase this gear. This will allow players who have reached level 90 to have additional sources of item level (ilevel) 450 gear to progress into the Dungeon Finder Heroic dungeons more readily.

Players who are looking to purchase this gear should seek out the following vendors:

Townlong Steppes:

Shadow-Pan - Rushin the Fox in Shado-Pan Garrison

All - Commander Lo Ping in Niuzao Temple

Vale of Eternal Blossoms:

August Celestials - Sage Lotusbloom or Sage Whiteheart in the Horde and Alliance Shrines